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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
Other Antioxidants. The vitamin E in blueberries may help stop the formation of cataracts, or clouding of the eye lens. Blueberries also contain anthocyanins, which are flavonoid pigments that act as antioxidants. In addition to promoting similar health benefits to other antioxidants for the eyes, anthocyanins maintain general eye health.